FIGURE 2. Distribution of inter-SNP distances.
From the following article:
A haplotype map of the human genome
The International HapMap Consortium
Nature 437, 1299-1320 (27 October 2005)
doi:10.1038/nature04226
The distributions are shown for each analysis panel for the HapMappable genome (defined in the Methods), for all common SNPs (with MAF 
0.05).